Cisco 7970G Administration Guide - Page 41

Chapter 1 An Overview of the Cisco Unified IP Phone Understanding Security Features for Cisco Unified IP Phones • Overview, page 1-23 • Required Network Components, page 1-23 • Best Practices-Requirements and Recommendations, page 1-24 Overview Cisco Unified IP phones and Cisco Catalyst switches have traditionally used Cisco Discovery Protocol (CDP) to identify each other and to determine parameters such as VLAN allocation and inline power requirements. However, CDP is not used to identify any locally attached PCs. Therefore, Cisco Unified IP Phones provide an EAPOL pass-through mechanism, whereby a PC locally attached to the IP phone may pass through EAPOL messages to the 802.1X authenticator in the LAN switch. This capability prevents the IP phone from having to act as the authenticator, yet allows the LAN switch to authenticate a data end point prior to accessing the network. In conjunction with the EAPOL pass-through mechanism, Cisco Unified IP Phones provide a proxy EAPOL-Logoff mechanism. If the locally attached PC is disconnected from the IP phone, the LAN switch would not see the physical link fail, because the link between the LAN switch and the IP phone is maintained. To avoid compromising network integrity, the IP phone sends an EAPOL-Logoff message to the switch on behalf of the downstream PC, which triggers the LAN switch to clear the authentication entry for the downstream PC. The Cisco Unified IP phones contain an 802.1X supplicant in addition to the EAPOL pass-through mechanism. This supplicant allows network administrators to control the connectivity of IP phones to the LAN switch ports. The IP phone 802.1X supplicant implements the EAP-MD5 option for 802.1X authentication. Required Network Components Support for 802.1X authentication on Cisco Unified IP Phones requires several components, including: • Cisco Unified IP Phone-The phone acts as the 802.1X supplicant, which initiates the request to access the network. • Cisco Secure Access Control Server (ACS) (or other third-party authentication server)-The authentication server and the phone must both be configured with a shared secret that is used to authenticate the phone. Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1 OL-14626-01 1-23